1-1/4" Isolation Flow Control Flange, Lead-Free, Thread x Flange

Integrated Flow & Service Control – Bell & Gossett Check-Trol™ 1-1/4" Isolation Flow Flange

The Bell & Gossett Check-Trol™ 1-1/4" Flow Control Flange simplifies hydronic pump installations by combining three key components into a single unit: an isolation valve, a spring-loaded flow check, and a flanged pump connection. Designed for closed-loop heating and cooling systems, this all-in-one valve assembly enables quick circulator servicing and prevents gravity circulation—streamlining system efficiency and minimizing downtime.

Its compact design and durable brass construction with a corrosion-resistant finish make it an ideal solution for both residential and commercial hydronic applications. Whether you’re installing a new system or upgrading an existing one, this valve delivers the control and performance today’s professionals demand.

Key Features & Advantages

• Three-in-One Functionality – Integrates isolation valve, spring check valve, and circulator flange in one compact fitting.
• Service-Friendly Design – Allows removal of the circulator pump without draining the entire system.
• Spring Check Mechanism – Prevents backflow and thermal siphoning during pump shutdown.
• Lead-Free Brass Construction – Meets low-lead compliance for potable applications.
• Flange Alignment – Companion flange design ensures easy alignment and stress-free pump installation.

Technical Specifications

• Connection Size: 1-1/4" NPT x Flange
• Overall Length: 4-7/16"
• Material: Lead-free brass, chrome-plated
• Max Operating Pressure: 150 PSI
• Max Operating Temperature: 200°F (93°C)
• Certifications: NSF/ANSI 372 compliant

Installation Insight

The Check-Trol™ flange is engineered for fast integration into pump circuits. It should be installed on the discharge side of the circulator, with the arrow on the valve body aligned with system flow. For best results and code compliance, installation should be performed by a licensed HVAC or plumbing professional familiar with hydronic system balancing and isolation techniques.

Contractor-Centric Benefits

For mechanical contractors, this flange eliminates the need for separate flow checks, unions, and isolation valves—reducing fittings, leak paths, and time on the job. It’s ideal for retrofits, boiler replacements, and system upgrades where space is tight and functionality is critical.

DIY Caution

While the unit offers simplified functionality, its installation requires precise alignment and system integration. It is not recommended for novice DIY use. Improper installation may compromise system performance or void warranty coverage.

Engineered for Performance

Bell & Gossett’s reputation for quality and innovation is built into every Check-Trol™ unit. With robust materials, intuitive operation, and compatibility with most standard circulators—including Bell & Gossett ecocirc® pumps—this flange is built for long-term performance and professional-grade reliability.

Upgrade with Confidence

For any contractor working on a hydronic system requiring reliable flow control and fast maintenance access, the Bell & Gossett Check-Trol™ 1-1/4" Flange delivers unmatched convenience and value. Streamline your install, minimize service disruptions, and protect system performance with a solution trusted throughout the industry.